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6 Marc L. Imhoff et al., “Assessing the Impact of Urban Sprawl on Soil Resources in the United States Using Nighttime ‘City Lights’ Satellite Images and Digital Soils Maps,” United States Geological Survey, last modified November 20, 2003, accessed April 22, 2011, http://biology.usgs.gov/luhna/chap3.html.

64 Robert Thompson, “Food for the Future: How, Where and Who Will Produce It?” (presented at Syracuse University, Syracuse, New York, January 6, 2011).

65 H.K. Gibbs et al., “Tropical Forests Were the Primary Source of New Agricultural Lands in the 1980s and 1990s,” Proceedings of the National Academy of Sciences of the United States, 107 (2010): 16732-16737, accessed April 14, 2011, doi: 10.1073/pnas.0910275107.